If you think you’ve already heard everything there is to know about Mitt Romney, think again. A 200-page document that appears to be Sen. John McCain’s entire 2008 election-year opposition research file on the former Massachusetts governor hit the Internet with a vengeance Tuesday evening. And it’s an eye-opener.

The file explores everything from the assessed value of Romney’s house (“$3.162 million”) to his views on the Boy Scouts’ ban of homosexuals (“publicly opposed … in 1994 and 2002 campaigns”). It was made public Tuesday on the social media website Buzzfeed, although it appears to have been accessible online for two months.

The document, given the name “The Romney Book,” was viewed less than 100 times on the page where it was originally uploaded by its anonymous leaker on November 11.

Neither McCain nor his former presidential campaign staffers have authenticated the untitled document, and McCain’s recent endorsement of Romney makes that highly unlikely. Still, the file is comprehensive enough — even by Washington, D.C. opposition-research standards — to suggest that it was assembled as a tool to counter a Romney candidacy on a national scale. And the news articles it references stop late in 2007.

After a four-page introduction and timeline of Romney’s personal and professional life, the file’s next six pages cover what the authors called “top hits.” The last six pages are an appendix describing a “Boston Video Archive.”

The extensive research on Romney’s business history includes many snippets and quotations from news stories that are no longer available online or have disappeared behind newspaper paywalls, making the file a likely gold mine for Romney’s political rivals this year.

For instance, a 1991 Boston Globe article explored how Bain “cultivated a mystique around the secretive firm, which was once dubbed ‘the KGB of consulting.’ Partners didn’t carry business cards and referred to clients by code names. … And it inculcated in the recruits such a sense of mission that young consultants became known as Bainies, a reference to the Unification Church’s Moonies.”

Citing a 1994 Globe article, the file concludes that “Romney used Drexel Burnham junk bonds to finance [a] 1988 leveraged buyout, right around the time SEC [Securities and Exchange Commission] officials were taking formal action against the company.”

In a followup article cited in the file, the Globe reported that Romney and another Bain Capital partner “defended their decision to hire Drexel before the SEC suit — at a time when rumors of the investigation were rife on Wall Street — as well as after the suit was filed.”

The dossier also explores the history of Bain’s business transactions related to Ampad, Maytag, Haier Group, and seven other companies that were subjects of Bain takeovers.

In the section covering Romney’s political liabilities, the document’s authors note his praise for Hillary Clinton during a 1998 event where he declared, “Hillary Clinton is very much right, it does take a village.” They also explore his support for former Salt Lake City mayor Rocky Anderson, who returned the favor by running an ad in which he said, “Take it from this liberal Democrat. If you want an amazing leader, vote for Mitt Romney.”

The authors also allege that Romney “opposed [Newt Gingrich’s 1994] Contract with America without even reading it.”

The video library, if it still exists, includes undated footage of Romney describing his position on assault-weapon bans as the “same as [Sen. John] Kerry and [the late Sen. Ted] Kennedy.”

In another video clip described in the file, Romney outlines a position on illegal immigration that closely approaches a recommendation for amnesty. “[T]hose who are here contrary to the law should seek to establish legal residence,” the document claims he said, “and if they do so, I’d be delighted to provide support.”

One tape, filed under the heading “awkward moments” is summarized by noting Romney’s observation that the Harlem Globetrotters basketball team has trouble making touchdowns.

In another, the document’s authors claim, Romney had this pearl of wisdom: “I thought becoming rich and famous would make me happy. Boy, was I right.”